Automatic output shutoff for low load: if the load current remains continuously below 50 mA, the output turns off to save power. Auto restart of charging on low battery: if the battery voltage drops below 4.1 V, the charging cycle starts again automatically. Safe automatic charge termination: after reaching the final float charging voltage, when the charging current falls to 100 mA, the charging cycle is terminated automatically. External key control for power display and 5 V output: connect an external key to the K pin and the output negative. A single short press turns on the power display and enables the 5 V output. Two consecutive short presses turn off the power display and disable the 5 V output. Key benefits and capabilities: Reliable power management: automatic on/off behavior based on load current, battery voltage, and charging current to optimize energy use and battery health. Simple user control: external key interface provides convenient on/off control of the display and the 5 V output without complex wiring. Safe charging workflow: automatic restart from low voltage and automatic termination at the appropriate current help prevent overcharging and protect battery life. Clear, predictable operation: straightforward thresholds and behavior support consistent performance in varied realworld conditions. Applications and use scenarios: Portable power banks and battery packs: ensures efficient energy use by turning off the output when not in use and recharging automatically when the battery is discharged. Small embedded projects requiring a controllable 5 V supply: use the external key to enable or disable the 5 V output as needed, with automatic protection features. Sensor or remote monitoring devices with userinitiated power control: external key provides a simple way to power the device on demand while the system manages charging and discharge safely. Compatibility and performance notes: Supports an external key interface connected to the K pin and the output negative for manual on/off control. Provides 5 V output when enabled and adheres to the stated currentbased control logic for load, charging, and termination.